It is currently a crucial time for grape bagging in Dali Prefecture, and mastering the proper techniques is essential for successful grape production. Ear bagging plays a vital role in protecting the appearance of the grapes and ensuring high-quality fruit. This method not only guards against pests and birds but also helps prevent cracking and premature ripening. After bagging, the incidence of diseases and pests significantly decreases, and the fruit develops a better color. The skin remains intact, allowing the natural beauty of each variety to shine through.
Late-maturing grape varieties are typically bagged in late June to reduce pesticide use, leaf damage, sunburn, and hail damage. This ensures clean, bright fruit with an attractive appearance. Bagging should be done after the first cluster has formed. When the fruit begins to develop and enters the heading stage, it’s time to apply the bags. Before bagging, it's recommended to soak the clusters or spray the leaves with a mixture of 22.2% Worn Dipase diluted at 1000–1200 times and 40% pyrimethanil diluted at 1000 times. Wait until the solution dries before proceeding.
The special transparent paper bags used for grapes are usually sterilized with a bactericide. They are cost-effective and highly effective, with each worker able to handle over 400 clusters per day. These paper bags are typically 35–40 cm long and 20–25 cm wide, and their size should be slightly larger than the actual ear when mature. All parts of the bag except the top opening are securely sealed—either stitched or glued. When placing the ear inside, the bag is inflated, and the cluster is carefully inserted. The top of the bag can then be tied to the fruiting branch near the stem.
After bagging, it's important to regularly inspect the clusters. If any rotting occurs, remove the bag immediately, treat the affected area, and replace it with a new one. When harvesting, the bags are removed along with the fruit. For colored grape varieties, the bottom of the bag can be peeled off a few days before harvest to promote even coloring.
It's important to note that the material used for the bags must allow good air circulation. Plastic bags or those with cut corners should be avoided, as they may trap moisture and increase the risk of disease.
Another effective technique is the use of "umbrella bags," which are especially suitable for trellis cultivation. These bags are made from medium-sized newspaper, plastic film, or cardboard. A slit is cut halfway down one side of the bag. When in use, the cluster is inserted along the slit, and the edges are aligned and pinned in place, resembling an umbrella covering the fruit. Umbrella bags protect against sunburn, dust, and disease while making spraying and inspection easier. This method is simple, efficient, and worth promoting in new production areas and trellis systems.
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